In hospital in Ottawa on Monday March 8th, 2010, William Costello (retired principal aide to Senator John Buchanan) at the age of 77 years. He will be sadly missed by his wife Eiko and daughter Melissa Costello and her husband Mike Darragh of Ottawa, sisters Isobel Weston of Ottawa, Elizabeth Durie and her husband David Speer of Stirling and Anne Allen of Georgetown, brother Garry Costello and his wife Connie of Toledo, nephew Peter Allen of Kanata, his family and good friends. Friends may pay their respects at the Blair & Son Funeral Home, 15 Gore St W., Perth Friday March 12th, 2010 from 2:00 to 4:00 and 6:00 to 8:00 P.M. Funeral service will be held in the chapel Saturday at 10:30 A.M. Interment, Elmwood Cemetery. In remembrance, contributions to the Bruyère Foundation, 43 Bruyère Street, Ottawa ON K1N 5C8 (613-562-6319) or the Salvation Army would be appreciated.